[Tinkering] Do you have this problem when making Trapped Boxes?

I am making trapped boxes w/30 tinkering, that will break the para spell. I make them regularly, but every once in a while something gets buggered. Normally, one has to target the crate to place the trap, but occasionally that will change and I start failing without ever targeting the box. When this happens, I seem to have zero chance of ever trapping a box and despite the fact that this has happened before, I never know what exactly corrects the situation.

I am not using UO assist. I am using GM Exceptional lockable crates which are positioned the correct way. I've closed and reopend my backpack and paperdoll in an attempt to correct the situation. I've logged out/back in, rebooted, etc.. in hopes that something simple like that will fix it. I've tried diff tinker tools, different crates... all to no avail.

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